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A high chromium roll spray quenching process

A technology of spray quenching and processing technology, which is applied in the direction of quenching devices, manufacturing tools, furnace types, etc., to achieve good quenching effect and uniform structure

Active Publication Date: 2017-09-29
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a high-chromium roll spray quenching processing technology, which quenches the roll by spray cooling, solves the problems existing in the production of high-chromium rolls in the existing air-cooling or air-cooling process, and improves Technical indicators of high chromium rolls after quenching

Method used

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  • A high chromium roll spray quenching process

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Effect test

Embodiment 1

[0033] A high chromium roll quenching method, comprising the following steps,

[0034] Step A, cleaning the roll surface of the roll, cleaning the oil stain on the roll surface of the roll;

[0035] Step B, checking the roll surface defects, checking whether there are casting defects on the roll surface and the end surface of the rolls, reprocessing the rolls with casting defects, and performing heat treatment on the rolls without casting defects. Casting defects include sand holes, pores, slag inclusions, cracks, bumps, and scratches.

[0036] Step C, heat treatment of the rolls in the furnace, first preheat the rolls in the preheating furnace, the preheating time is 57 hours, the preheating temperature is 510 °C, after the preheating is completed, transfer the rolls to the differential temperature furnace for temperature difference Heating, the heating time is 2.5 hours, and the heating temperature is 850°C. After the heating is completed, the rolls are released from the fu...

Embodiment 2

[0040] A high chromium roll quenching method, comprising the following steps,

[0041] Step A, cleaning the roll surface of the roll, cleaning the oil stain on the roll surface of the roll;

[0042] Step B, checking the roll surface defects, checking whether there are casting defects on the roll surface and the end surface of the rolls, reprocessing the rolls with casting defects, and performing heat treatment on the rolls without casting defects. Casting defects include sand holes, pores, slag inclusions, cracks, bumps, and scratches.

[0043] Step C, heat treatment of the rolls in the furnace, first preheat the rolls in the preheating furnace, the preheating time is 63 hours, the preheating temperature is 590 °C, after the preheating is completed, transfer the rolls to the differential temperature furnace for temperature difference Heating, the heating time is 2.3 hours, and the heating temperature is 1000°C. After the heating is completed, the rolls are released from the f...

Embodiment 3

[0047] A high chromium roll quenching method, comprising the following steps,

[0048] Step A, cleaning the roll surface of the roll, cleaning the oil stain on the roll surface of the roll;

[0049] Step B, checking the roll surface defects, checking whether there are casting defects on the roll surface and the end surface of the rolls, reprocessing the rolls with casting defects, and performing heat treatment on the rolls without casting defects. Casting defects include sand holes, pores, slag inclusions, cracks, bumps, and scratches.

[0050] Step C, heat treatment of the roll in the furnace, first preheat the roll in the preheating furnace, the preheating time is 60 hours, the preheating temperature is 550 °C, after the preheating is completed, transfer the roll to the differential temperature furnace for temperature difference Heating, the heating time is 3 hours, and the heating temperature is 900°C. After the heating is completed, the rolls are released from the furnace...

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Abstract

The invention discloses a high chrome roller atomizing and quenching machining technology. The technology comprises the following steps that firstly, greasy dirt on the surface of a roller is cleared away; secondly, it is checked whether casting defects exist on the roller face and the end face of the roller or not; thirdly, heating is carried out on the roller in a pre-heating furnace, after the heating is completed, the roller is transferred into a differential temperature furnace to be subjected to differential heating; fourthly, the roller is installed on a spraying and quenching machine, the position of a bearing trolley and the position of a roller rotating device in the spraying and quenching machine are adjusted, the roller is transferred by the bearing trolley from the differential temperature furnace, and a nozzle of the spraying and quenching machine is aligned with a roller body of the roller; fifthly, an air pump is acted, blowing is carried out on the roller, and a water pump is acted for half minute; sixthly, atomizing is carried out, the device operating state is detected in the atomizing process, it is guaranteed that the device is operated normally, and oxide skin on the roller body of the roller is removed in real time; finally, the water pump and the air pump are closed, and quenching is completed. According to the high chrome roller atomizing and quenching machining technology, the heat treatment requirement of the high chrome roller is met, the organization is even, and the quenching effect is good.

Description

technical field [0001] The invention relates to a high-chromium roll heat treatment process, in particular to a process for quenching the roll by spray cooling. Background technique [0002] Carry out heat treatment on the roll, heating and quenching to increase the hardness of the roll. During the quenching and cooling process of the conventional roll product, it is quenched by air cooling or blowing into air cooling; while the high chromium roll, if it is air-cooled or air-cooled, the quenching effect is not good. Well, due to insufficient cooling rate and insufficient roll hardness, the technical indicators of the design requirements cannot be met. The quenching method of oil quenching or water quenching is too fast, which may easily cause cracking of the roll, and the production failure of the roll quenching will cause waste and bring economic losses to the enterprise. [0003] The spray quenching machine is a device for quenching the rolls, including a load-carrying ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/38C21D1/667C21D1/18
Inventor 程志平张建吴昊
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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